Technologies used

Now works with SharePoint 2013 and SharePoint Online / Office 365 !!

HOWEVER Microsoft have announced that they have 'depreciated' Sandbox Solutions that contain code (as SPrello does).

At some point Microsoft plan to phase out support for these "responsibly" and presumably they will stop working in Office 365 and also probably in later version of "On Premises" SharePoint.

The announcements don't give timescales for when this will happen so use this at your own risk. *

It would be possible to use most of the techniques here and migrate the code to the new App Model but this is won't be done by the original authors so evaluate this risk if you're using this project in a production environment.